Door knob



FIG. 1 is a front elevational view of the door knob of the present invention;

FIG. 2 is a top view thereof;

FIG. 3 is a left side elevation view thereof, the right side elevation view being the mirror image thereof;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a door knob, as shown and described. 